Here are some websites that could be useful for your Civil War project. These websites are not limited. Please look for and use others, as well.

http://www.sunsite.utk.edu/civil-war/warweb.html

http://www.gettysburg.edu/library/gettdigital/civil_war/civilwar.htm

http://memory.loc.gov/ammem/cwphtml/cwphome.html
Library of Congress site with emphasis on Civil War photos

http://www.civilwar.org/
Great resource on Civil War battles

http://www.harpweek.com/
This site has political cartoons

http://www.civil-war.net/
This site has a lot of information about the war

http://www.pbs.org/wgbh/amex/lincolns/index.html
Information about the war

http://www.pbs.org/civilwar/
More information about the war

http://www.gilderlehrman.org/teachers/module10/index.html
A lot of primary sources